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Electrolyte for 4.5 V lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low charging and discharging efficiency of lithium-ion batteries, poor cycle performance, and restrictions on the development of high-voltage lithium-ion batteries, and achieve improvement High-pressure cycle performance, not easy to decompose, and obvious effect

Inactive Publication Date: 2013-12-11
嘉德力电源科技(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrolyte of lithium-ion batteries is easy to decompose under high voltage, resulting in low charge and discharge efficiency and poor cycle performance of lithium-ion batteries, which restricts the further development of high-voltage lithium-ion batteries. Therefore, it is necessary to develop high-voltage cathode materials suitable for high-voltage applications. electrolyte, will be of great significance

Method used

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  • Electrolyte for 4.5 V lithium ion battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0012] Lithium-ion battery electrolyte that is not easy to decompose under 4.5V high voltage, including a nitrile compound, which is succinonitrile, when the high-voltage additive is used in the lithium-ion battery electrolyte, the mass percentage of the electrolyte 0.1%. The organic solvent in the electrolyte is a mixture of ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC), where the mass ratio of EC, DMC and EMC is 40%:40%:20% . The electrolytes of Li-ion batteries were 1.0 M LiPF 6 It is denoted as electrolyte B, and the electrolyte without additives is denoted as A.

[0013] Inject A and B electrolytes into the positive electrode LiCoPO 4 , In an aluminum case lithium-ion battery with an artificial graphite as the negative electrode (nominal capacity is 650Ah), a 0.5C charge-discharge cycle is performed within the voltage range of 3.0~4.5V. The capacity retention rate of the battery using A electrolyte is about 35% after 200 cycles, w...

Embodiment 2

[0015] The lithium-ion battery electrolyte that is not easy to decompose under a high voltage of 4.5V contains a nitrile compound, which is cyclohexyl nitrile. When the high-voltage additive is used in the lithium-ion battery electrolyte, the proportion of The mass percentage is 2.0%. The organic solvent in the electrolyte is a mixture of ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC), where the mass ratio of EC, DMC and EMC is 40%:40%:20% . The electrolyte of Li-ion batteries is 1.0 M LiPF 6 Denoted as electrolyte C.

[0016] Inject the C electrolyte into the cathode LiCoPO 4 , In an aluminum case lithium-ion battery with an artificial graphite negative pole (nominal capacity is 650Ah), a 1C charge-discharge cycle is performed within the voltage range of 3.0~4.5V. After 200 cycles of electrolyte battery cycle, the battery capacity retention rate reaches more than 75%.

Embodiment 3

[0018] The lithium-ion battery electrolyte that is not easily decomposed under a high voltage of 4.5V contains a nitrile compound, which is phthalonitrile. When the high-voltage additive is used in the lithium-ion battery electrolyte, the The mass percentage accounted for is 1.5%. The organic solvent in the electrolyte is a mixture of ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC), where the mass ratio of EC, DMC and EMC is 40%:40%:20% . The electrolyte of Li-ion batteries is 1.0 M LiPF 6 Denoted as electrolyte D.

[0019] Inject the D electrolyte into the positive electrode LiCoPO 4 , in an aluminum case lithium-ion battery with artificial graphite as the negative electrode (nominal capacity is 650Ah), 1C charge-discharge cycle is performed in the voltage range of 3.0~4.5V, and the battery capacity retention rate of the battery after 200 cycles of the electrolyte reaches more than 80%. .

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Abstract

The invention relates to an electrolyte for a 4.5 V lithium ion battery. The electrolyte comprises the following components in percentage by weight: 80%-89% of organic solvents, 10%-15% of lithium salt and 0.1%-5.0% of additives, wherein the additives are nitrile compounds, and the nitrile compounds include one of butanedinitrile, adiponitrile, sebaconitrile, acrylonitrile, cyclohexyl nitrile, 1,2-cyclohexyl dinitrile, phthalonitrile and cyanopyridine. According to the invention, the additives effectively improve the high-pressure cycle property of the lithium ion battery, can enhance the voltage of a common electrolyte to 4.5 V and are obvious in effect. The electrolyte disclosed by the invention is difficult to decompose under high voltage of 4.5 V, obviously enhances the cycle property of the lithium ion battery, and less influences the battery capacity.

Description

technical field [0001] The invention relates to an electrolyte solution for a 4.5V lithium ion battery and belongs to the technical field of lithium ion batteries. Background technique [0002] As a new type of green high-energy battery, lithium-ion batteries are widely used in mobile phones, cameras, notebooks, etc. Portable devices such as computers. With the application in electric vehicles, cordless power tools and military, higher requirements are placed on the energy density of lithium-ion batteries, and LiNiMnO 4 , LiNiCoMnO 2 、LiCoPO 4 Li-ion deintercalation reactions can occur at higher voltages, thus bringing new hope for improving the energy density of Li-ion batteries. However, the electrolyte of lithium-ion batteries is easy to decompose under high voltage, resulting in low charge and discharge efficiency and poor cycle performance of lithium-ion batteries, which restricts the further development of high-voltage lithium-ion batteries. Therefore, it is necess...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCY02E60/10
Inventor 刘明贤徐海林肖军
Owner 嘉德力电源科技(苏州)有限公司
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